From: "Marek Behún" <marek.behun@nic.cz>
To: Russell King - ARM Linux admin <linux@armlinux.org.uk>
Cc: Andrew Lunn <andrew@lunn.ch>,
Maxime Chevallier <maxime.chevallier@bootlin.com>,
Baruch Siach <baruch@tkos.co.il>, Chris Healy <cphealy@gmail.com>,
Florian Fainelli <f.fainelli@gmail.com>,
netdev@vger.kernel.org
Subject: Re: [PATCH RFC russell-king 3/4] net: phy: marvell10g: change MACTYPE according to phydev->interface
Date: Wed, 12 Aug 2020 18:28:17 +0200 [thread overview]
Message-ID: <20200812182817.1bb7bb4a@dellmb.labs.office.nic.cz> (raw)
In-Reply-To: <20200812162232.GT1551@shell.armlinux.org.uk>
On Wed, 12 Aug 2020 17:22:32 +0100
Russell King - ARM Linux admin <linux@armlinux.org.uk> wrote:
> On Wed, Aug 12, 2020 at 06:13:33PM +0200, Marek Behún wrote:
> > The MACTYPE is not being lost. But changing it requires Port
> > Software Reset, which resets the link, so it cannot be done for
> > example in read_status.
>
> Wouldn't the right place to configure it be in the config_init()
> method - which is called once we have a MAC attaching to the PHY?
> As I mentioned, if we had a way to pass the MAC interface supported
> mask into phylib, config_init() could then use that to determine what
> to do.
>
It is done from config_init. mv3310_power_up is called from
mv3310_config_init.
> > I think the MACTYPE should be set sometime during PHY
> > initialisation, and only once: either to XFI with rate matching, if
> > the underlying MAC does not support lower modes, or to
> > 10gbase-r/2500base-x/sgmii mode, if the underlying MAC supports
> > only slower modes than 10G.
>
> Yes - only changing the MAC type if we have good reason to do so to
> support other rates.
>
> There is a related problem however. Note that if you have an 88x3310
> (non-P) in the SFP, then when rate matching is enabled, the PHY will
> _not_ generate pause frames, and the PHY expects the MAC to be
> configured to pace itself to the slower speed. I don't believe we
> have support in MACs for that, but phylib and therefore phylink
> provides the information:
>
> interface - 10GBASE-R
> speed - media speed
> pause - media pause modes
>
> So, if speed != SPEED_10000 and there are no pause modes, we should,
> for the sake of the entire link, pace the MAC to the media speed by
> controlling its egress rate.
>
next prev parent reply other threads:[~2020-08-12 16:28 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-10 22:06 [PATCH RFC russell-king 0/4] Support for RollBall 10G copper SFP modules Marek Behún
2020-08-10 22:06 ` [PATCH RFC russell-king 1/4] net: phy: add I2C mdio bus for RollBall compatible SFPs Marek Behún
2020-08-10 22:06 ` [PATCH RFC russell-king 2/4] net: phy: sfp: add support for multigig RollBall modules Marek Behún
2020-08-11 15:15 ` Russell King - ARM Linux admin
2020-08-12 13:33 ` Marek Behún
2020-08-12 14:33 ` Russell King - ARM Linux admin
2020-08-12 14:42 ` Marek Behún
2020-08-10 22:06 ` [PATCH RFC russell-king 3/4] net: phy: marvell10g: change MACTYPE according to phydev->interface Marek Behún
2020-08-11 15:21 ` Russell King - ARM Linux admin
2020-08-12 14:44 ` Marek Behún
2020-08-12 15:00 ` Russell King - ARM Linux admin
2020-08-12 15:37 ` Marek Behún
2020-08-12 15:48 ` Russell King - ARM Linux admin
2020-08-12 15:59 ` Marek Behún
2020-08-12 16:13 ` Marek Behún
2020-08-12 16:22 ` Russell King - ARM Linux admin
2020-08-12 16:28 ` Marek Behún [this message]
2020-08-12 16:30 ` Russell King - ARM Linux admin
2020-08-12 16:01 ` Russell King - ARM Linux admin
2020-08-12 16:15 ` Marek Behún
2020-08-12 15:44 ` Andrew Lunn
2020-08-12 15:54 ` Russell King - ARM Linux admin
2020-08-18 17:28 ` Marek Behún
2020-08-10 22:06 ` [PATCH RFC russell-king 4/4] net: phylink: don't fail attaching phy on 1000base-x/2500base-x mode Marek Behún
2020-08-11 15:08 ` [PATCH RFC russell-king 0/4] Support for RollBall 10G copper SFP modules Russell King - ARM Linux admin
2020-08-12 12:31 ` Marek Behún
2020-08-12 12:31 ` Marek Behún
2020-08-12 14:20 ` Marek Behún
2020-08-17 13:49 ` Russell King - ARM Linux admin
2020-08-18 13:43 ` Marek Behún
2020-08-18 15:08 ` Russell King - ARM Linux admin
2020-08-18 15:30 ` Marek Behún
2020-08-18 15:36 ` Russell King - ARM Linux admin
2020-08-18 15:47 ` Marek Behún
2020-08-18 16:34 ` Russell King - ARM Linux admin
2020-08-19 15:49 ` Marek Behún
2020-08-19 15:54 ` Marek Behún
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